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<a href="util_2util_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/* Flow</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * Copyright 2023 Akamai Technologies, Inc.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * Licensed under the Apache License, Version 2.0 (the</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * &quot;License&quot;); you may not use this file except in</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> * compliance with the License.  You may obtain a copy</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * of the License at</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> *</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> *   https://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> *</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"> * Unless required by applicable law or agreed to in</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> * writing, software distributed under the License is</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> * distributed on an &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> * CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> * See the License for the specific language governing</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> * permissions and limitations under the License. */</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"></span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment">/// @file</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment"></span><span class="preprocessor">#pragma once</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span> </div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="preprocessor">#include &quot;<a class="code" href="util__fwd_8hpp.html">flow/util/util_fwd.hpp</a>&quot;</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="preprocessor">#include &quot;<a class="code" href="string__ostream_8hpp.html">flow/util/string_ostream.hpp</a>&quot;</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span><span class="preprocessor">#include &lt;boost/lexical_cast.hpp&gt;</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span><span class="preprocessor">#include &lt;boost/algorithm/string.hpp&gt;</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span> </div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceflow_1_1util.html">flow::util</a></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span>{</div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span> </div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span><span class="comment">// Types.</span></div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span><span class="comment"></span> </div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span><span class="comment">/**</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span><span class="comment"> * An empty interface, consisting of nothing but a default `virtual` destructor, intended as a boiler-plate-reducing</span></div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span><span class="comment"> * base for any other (presumably `virtual`-method-having) class that would otherwise require a default `virtual`</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span><span class="comment"> * destructor.</span></div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span><span class="comment"> *</span></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span><span class="comment"> * Usually, if you have a base class `C` at the top of a `virtual`-method-having hierarchy, then it needs a `virtual`</span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span><span class="comment"> * destructor, even if it is `= default` or `{}`.  Otherwise, trying to delete an object of subclass `C2 : public C`</span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span><span class="comment"> * via a `C*` pointer will fail to call destructor `~C2()` -- which may not be empty, causing leaks and so on.</span></div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span><span class="comment"> * Declaring `~C()` and its empty implementation is surprisingly verbose.  So, instead, don&#39;t; and `public`ly derive</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span><span class="comment"> * from Null_interface instead.</span></div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span><span class="comment"> *</span></div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span><span class="comment"> * It is particularly useful for interface classes.</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span><span class="comment"> */</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Null__interface.html">   44</a></span><span class="keyword">class </span><a class="code hl_class" href="classflow_1_1util_1_1Null__interface.html">Null_interface</a></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span>{</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span><span class="keyword">public</span>:</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span>  <span class="comment">// Destructor.</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span><span class="comment"></span> </div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span><span class="comment">   * Boring `virtual` destructor.</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span><span class="comment">   *</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span><span class="comment">   * Why is it pure? Main reason: Then Null_interface becomes abstract and cannot be itself instantiated, which is good.</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span><span class="comment">   * Otherwise we&#39;d need a `protected` constructor or something to prevent it.</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span><span class="comment">   *</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span><span class="comment">   * I (ygoldfel) actually thought this means a subclass *has* to now define a body (even if merely `= default` or</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span><span class="comment">   * `{}`): but no: the compiler will (and must) generate an empty (and, because of us, `virtual`) destructor for any</span></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span><span class="comment">   * subclass that doesn&#39;t explicitly define one.  A destructor isn&#39;t a regular method, so that&#39;s how it works.</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span><span class="comment">   * There will not be a linker error.</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span><span class="comment">   */</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Null__interface.html#a5916282577627e424a09884347eddbba">   60</a></span>  <span class="keyword">virtual</span> <a class="code hl_function" href="classflow_1_1util_1_1Null__interface.html#a5916282577627e424a09884347eddbba">~Null_interface</a>() = 0;</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span>};</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span><span class="comment"></span> </div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span><span class="comment">/**</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span><span class="comment"> * Useful as a no-unique-address private member to make a type noncopyable while keeping that type an aggregate</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span><span class="comment"> * (can be direct-initialized).</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span><span class="comment"> *</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span><span class="comment"> * So you can do: `[[no_unique_address]] flow::util::Noncopyable m_nc{};`.</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span><span class="comment"> *</span></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span><span class="comment"> * ### Rationale ###</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span><span class="comment"> * The usual technique of deriving from `boost::noncopyable` disables aggregateness.  In C++20 declaring</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span><span class="comment"> * a `= delete` copy ctor also disables it.  This trick still works though.</span></div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span><span class="comment"> */</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"><a class="line" href="structflow_1_1util_1_1Noncopyable.html">   73</a></span><span class="keyword">struct </span><a class="code hl_struct" href="structflow_1_1util_1_1Noncopyable.html">Noncopyable</a></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span>{</div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span>  <span class="comment">// Constructors/destructor.</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span><span class="comment"></span> </div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span><span class="comment">  /// Makes it possible to instantiate.</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"><a class="line" href="structflow_1_1util_1_1Noncopyable.html#ac59627ad248129dd7b37d2d9286761cf">   78</a></span><span class="comment"></span>  <a class="code hl_function" href="structflow_1_1util_1_1Noncopyable.html#ac59627ad248129dd7b37d2d9286761cf">Noncopyable</a>() = <span class="keywordflow">default</span>;<span class="comment"></span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span><span class="comment">  /// Forbid copying.</span></div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"><a class="line" href="structflow_1_1util_1_1Noncopyable.html#a14a71cd2314f39996c2609ab383145e8">   80</a></span><span class="comment"></span>  <a class="code hl_function" href="structflow_1_1util_1_1Noncopyable.html#a14a71cd2314f39996c2609ab383145e8">Noncopyable</a>(<span class="keyword">const</span> <a class="code hl_struct" href="structflow_1_1util_1_1Noncopyable.html">Noncopyable</a>&amp;) = <span class="keyword">delete</span>;</div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span> </div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span>  <span class="comment">// Methods.</span></div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span><span class="comment"></span> </div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span><span class="comment">  /// Forbid copying.</span></div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"><a class="line" href="structflow_1_1util_1_1Noncopyable.html#a50501b7b5fcc26f2bcb4503c7b32a360">   85</a></span><span class="comment"></span>  <span class="keywordtype">void</span> <a class="code hl_function" href="structflow_1_1util_1_1Noncopyable.html#a50501b7b5fcc26f2bcb4503c7b32a360">operator=</a>(<span class="keyword">const</span> <a class="code hl_struct" href="structflow_1_1util_1_1Noncopyable.html">Noncopyable</a>&amp;) = <span class="keyword">delete</span>;</div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span>};</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span><span class="comment"></span> </div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span><span class="comment">/**</span></div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span><span class="comment"> * A simple RAII-pattern class template that, at construction, sets the specified location in memory to a specified</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span><span class="comment"> * value, memorizing the previous contents; and at destruction restores the value.  E.g.:</span></div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span><span class="comment"> *</span></div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span><span class="comment"> *   ~~~</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span><span class="comment"> *   thread_local int s_this_thread_val;</span></div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span><span class="comment"> *   ...</span></div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span><span class="comment"> *   {</span></div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span><span class="comment"> *     Scoped_setter&lt;int&gt; setter(&amp;s_this_thread_val, 75); // Set it to 75 and memorize (whatever).</span></div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span><span class="comment"> *     ...</span></div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span><span class="comment"> *     {</span></div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span><span class="comment"> *       Scoped_setter&lt;int&gt; setter(&amp;s_this_thread_val, 125); // Set it to 125 and memorize 75.</span></div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span><span class="comment"> *       ...</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span><span class="comment"> *     } // Restored from 125 to 75.</span></div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span><span class="comment"> *     ...</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span><span class="comment"> *   } // Restored from (probably) 75 to (whatever).</span></div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span><span class="comment"> *   ~~~</span></div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span><span class="comment"> *</span></div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span><span class="comment"> * The object is movable, not copyable (which is similar to `unique_ptr`) to prevent &quot;double-restore.&quot;  Related:</span></div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span><span class="comment"> * one can easily return customized auto-setter/restorers:</span></div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span><span class="comment"> *</span></div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span><span class="comment"> *   ~~~</span></div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span><span class="comment"> *   thread_local Widget s_widget;</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span><span class="comment"> *   auto widget_setter_auto(Widget&amp;&amp; widget_moved)</span></div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span><span class="comment"> *   {</span></div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span><span class="comment"> *     return flow::util::Scoped_setter&lt;Widget&gt;(&amp;s_widget, std::move(widget_moved));</span></div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span><span class="comment"> *   }</span></div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span><span class="comment"> *   ...</span></div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span><span class="comment"> *     { // Later, some block: Set s_widget.  Code here doesn&#39;t even know/care a Scoped_setter is involved.</span></div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span><span class="comment"> *       const auto setter_auto = widget_setter_auto({ ...widget-init... });</span></div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span><span class="comment"> *       ...</span></div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span><span class="comment"> *     } // Restore s_widget.</span></div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span><span class="comment"> *   ~~~</span></div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno">  121</span><span class="comment"> *</span></div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span><span class="comment"> * ### Thready safety ###</span></div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span><span class="comment"> * This is a simple object: it just performs a few assignments without any added</span></div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span><span class="comment"> * concurrency protection.  If the memory location can be accessed simultaneously by other threads, watch out.</span></div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span><span class="comment"> *</span></div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno">  126</span><span class="comment"> * In particular it&#39;s a good fit for thread-local locations: `&amp;X`, where `X` is declared `thread_local`, or</span></div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span><span class="comment"> * `X == *(P.get())` where `P` is a `boost::thread_specific_ptr`.</span></div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno">  128</span><span class="comment"> *</span></div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno">  129</span><span class="comment"> * @tparam Value</span></div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno">  130</span><span class="comment"> *         The stored type, which must be move-assignable and move-constructible.</span></div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span><span class="comment"> *         All `Value` writes are performed using exclusively these operations.</span></div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span><span class="comment"> *         Informally: For best performance when `Value` is a heavy-weight type, these operations should be</span></div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span><span class="comment"> *         be written to be light-weight, such as in terms of swapping a few scalars.</span></div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span><span class="comment"> *         In particular this is already the case for all STL-compliant container types.</span></div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span><span class="comment"> *</span></div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span><span class="comment"> * @internal</span></div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span><span class="comment"> * ### Implementation ###</span></div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno">  138</span><span class="comment"> * An alternative implementation, which could even be reduced to just an alias, would have used `unique_ptr`.</span></div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span><span class="comment"> * However in this case I (ygoldfel) wanted maximum control for perf.  The use case originally driving this was</span></div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span><span class="comment"> * the thread-local verbosity override: log::Config::this_thread_verbosity_override_auto().  flow::log is fairly</span></div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno">  141</span><span class="comment"> * paranoid about performance, in general, although admittedly this particular call isn&#39;t necessarily ubiquitous.</span></div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno">  142</span><span class="comment"> */</span></div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Value&gt;</div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Scoped__setter.html">  144</a></span><span class="keyword">class </span><a class="code hl_class" href="classflow_1_1util_1_1Scoped__setter.html">Scoped_setter</a></div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span>{</div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno">  146</span><span class="keyword">public</span>:</div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno">  147</span>  <span class="comment">// Constructors/destructor.</span></div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno">  148</span><span class="comment"></span> </div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno">  149</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno">  150</span><span class="comment">   * Post-condition: `*target` contains was `val_src_moved` contained at ctor entry; and the destructor invocation shall</span></div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno">  151</span><span class="comment">   * reverse this, so that `*target` is restored to its value at entry.</span></div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno">  152</span><span class="comment">   *</span></div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno">  153</span><span class="comment">   * `*this` cannot be copied, but it can be moved.  As a result, it is guaranteed that the aforementioned destructor</span></div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno">  154</span><span class="comment">   * will execute exactly once; however it can be move-constructed-from-`*this` other Scope_setter&#39;s destructor,</span></div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno">  155</span><span class="comment">   * while our own dtor therefore is a no-op.</span></div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno">  156</span><span class="comment">   *</span></div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno">  157</span><span class="comment">   * @param target</span></div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno">  158</span><span class="comment">   *        The target object that shall be set to `val_src_moved` now and restored in our, or moved-object&#39;s, dtor.</span></div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno">  159</span><span class="comment">   *        The current value of `*target` is saved internally via assignment of `move(*target)`.</span></div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno">  160</span><span class="comment">   *        Behavior undefined (assertion may trip) if null.</span></div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno">  161</span><span class="comment">   * @param val_src_moved</span></div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno">  162</span><span class="comment">   *        Value to save to `*target` immediately, via assignment of `move(val_src_moved)`.</span></div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno">  163</span><span class="comment">   */</span></div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno">  164</span>  <span class="keyword">explicit</span> <a class="code hl_function" href="classflow_1_1util_1_1Scoped__setter.html#acd854f798e440e7f4a4c18c7b83443fc">Scoped_setter</a>(Value* target, Value&amp;&amp; val_src_moved);</div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno">  165</span><span class="comment"></span> </div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno">  166</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno">  167</span><span class="comment">   * Move constructor:  `*this` acts as `src_moved` would-have, while `src_moved` becomes a no-op object permanently.</span></div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno">  168</span><span class="comment">   *</span></div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno">  169</span><span class="comment">   * @param src_moved</span></div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno">  170</span><span class="comment">   *        Source object.  Its destructor shall do nothing after this returns.</span></div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno">  171</span><span class="comment">   */</span></div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno">  172</span>  <a class="code hl_function" href="classflow_1_1util_1_1Scoped__setter.html#acd854f798e440e7f4a4c18c7b83443fc">Scoped_setter</a>(<a class="code hl_class" href="classflow_1_1util_1_1Scoped__setter.html">Scoped_setter</a>&amp;&amp; src_moved);</div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno">  173</span><span class="comment"></span> </div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno">  174</span><span class="comment">  /// Prohibit copying: for each `explicit` ctor invocation, there shall be exactly 1 non-no-op dtor invocation.</span></div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Scoped__setter.html#a9f61f7f731e78c9760b925b577cdd503">  175</a></span><span class="comment"></span>  <a class="code hl_function" href="classflow_1_1util_1_1Scoped__setter.html#a9f61f7f731e78c9760b925b577cdd503">Scoped_setter</a>(<span class="keyword">const</span> <a class="code hl_class" href="classflow_1_1util_1_1Scoped__setter.html">Scoped_setter</a>&amp;) = <span class="keyword">delete</span>;</div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno">  176</span><span class="comment"></span> </div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno">  177</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno">  178</span><span class="comment">   * Restores `*target` (from main ctor) to its value at entry to said ctor; or does nothing if `*this` has been</span></div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno">  179</span><span class="comment">   * moved-from via the move ctor.</span></div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno">  180</span><span class="comment">   */</span></div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno">  181</span>  <a class="code hl_function" href="classflow_1_1util_1_1Scoped__setter.html#a12ca74f225f756458f872e6f0da60695">~Scoped_setter</a>();</div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno">  182</span> </div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno">  183</span>  <span class="comment">// Methods.</span></div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno">  184</span><span class="comment"></span> </div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno">  185</span><span class="comment">  /// Prohibit copying (see `delete`d copy ctor).</span></div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Scoped__setter.html#aa4464d1c39413033a0e457a494363bce">  186</a></span><span class="comment"></span>  <a class="code hl_class" href="classflow_1_1util_1_1Scoped__setter.html">Scoped_setter</a>&amp; <a class="code hl_function" href="classflow_1_1util_1_1Scoped__setter.html#aa4464d1c39413033a0e457a494363bce">operator=</a>(<span class="keyword">const</span> <a class="code hl_class" href="classflow_1_1util_1_1Scoped__setter.html">Scoped_setter</a>&amp;) = <span class="keyword">delete</span>;</div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno">  187</span><span class="comment"></span> </div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno">  188</span><span class="comment">  /// Prohibit modifying existing `*this`; except that moving-from is enabled via the move ctor.</span></div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Scoped__setter.html#ae0dcbc446c250933940ead3cb589c1eb">  189</a></span><span class="comment"></span>  <a class="code hl_class" href="classflow_1_1util_1_1Scoped__setter.html">Scoped_setter</a>&amp; <a class="code hl_function" href="classflow_1_1util_1_1Scoped__setter.html#ae0dcbc446c250933940ead3cb589c1eb">operator=</a>(<a class="code hl_class" href="classflow_1_1util_1_1Scoped__setter.html">Scoped_setter</a>&amp;&amp;) = <span class="keyword">delete</span>;</div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno">  190</span> </div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno">  191</span><span class="keyword">private</span>:</div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno">  192</span>  <span class="comment">// Data.</span></div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno">  193</span><span class="comment"></span> </div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno">  194</span><span class="comment">  /// Target object location; see ctors; if null then this is a moved-from Scoped_setter that intentionally no-ops.</span></div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Scoped__setter.html#ab36f9981921da6540fc5c308e4c19a9c">  195</a></span><span class="comment"></span>  Value* <a class="code hl_variable" href="classflow_1_1util_1_1Scoped__setter.html#ab36f9981921da6540fc5c308e4c19a9c">m_target_or_null</a>;</div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno">  196</span><span class="comment"></span> </div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno">  197</span><span class="comment">  /// If and only if #m_target_or_null is non-null, this saves `*m_target_or_null`.  Otherwise meaningless.</span></div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Scoped__setter.html#a8547c08154499e1694202da49afb7202">  198</a></span><span class="comment"></span>  Value <a class="code hl_variable" href="classflow_1_1util_1_1Scoped__setter.html#a8547c08154499e1694202da49afb7202">m_saved_value</a>;</div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno">  199</span>}; <span class="comment">// class Scoped_setter</span></div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno">  200</span> </div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno">  201</span><span class="comment">// Template implementations.</span></div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno">  202</span> </div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno">  203</span><span class="comment">// Scoped_setter template implementations.</span></div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno">  204</span> </div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno">  205</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Value&gt;</div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Scoped__setter.html#acd854f798e440e7f4a4c18c7b83443fc">  206</a></span><a class="code hl_function" href="classflow_1_1util_1_1Scoped__setter.html#acd854f798e440e7f4a4c18c7b83443fc">Scoped_setter&lt;Value&gt;::Scoped_setter</a>(Value* target, Value&amp;&amp; val_src_moved) :</div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno">  207</span>  m_target_or_null(target),</div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno">  208</span>  m_saved_value(std::move(*m_target_or_null))</div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno">  209</span>{</div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno">  210</span>  *<a class="code hl_variable" href="classflow_1_1util_1_1Scoped__setter.html#ab36f9981921da6540fc5c308e4c19a9c">m_target_or_null</a> = std::move(val_src_moved);</div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno">  211</span>}</div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno">  212</span> </div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno">  213</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Value&gt;</div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Scoped__setter.html#a2ac7e58548cfe7989835b11fdc97f02c">  214</a></span><a class="code hl_function" href="classflow_1_1util_1_1Scoped__setter.html#acd854f798e440e7f4a4c18c7b83443fc">Scoped_setter&lt;Value&gt;::Scoped_setter</a>(<a class="code hl_class" href="classflow_1_1util_1_1Scoped__setter.html">Scoped_setter</a>&amp;&amp; src_moved) : <span class="comment">// =default might work fine but to be clear/certain:</span></div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno">  215</span>  m_target_or_null(src_moved.m_target_or_null),</div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno">  216</span>  m_saved_value(std::move(src_moved.m_saved_value))</div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno">  217</span>{</div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno">  218</span>  assert(<a class="code hl_variable" href="classflow_1_1util_1_1Scoped__setter.html#ab36f9981921da6540fc5c308e4c19a9c">m_target_or_null</a> &amp;&amp; <span class="stringliteral">&quot;Should not be moving-from a thing that has already been moved-from.&quot;</span>);</div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno">  219</span> </div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno">  220</span>  src_moved.m_target_or_null = <span class="keyword">nullptr</span>;</div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno">  221</span>  <span class="comment">// As promised: Now src_moved&#39;s dtor will no-op.</span></div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno">  222</span>}</div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno">  223</span> </div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno">  224</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Value&gt;</div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Scoped__setter.html#a12ca74f225f756458f872e6f0da60695">  225</a></span><a class="code hl_function" href="classflow_1_1util_1_1Scoped__setter.html#a12ca74f225f756458f872e6f0da60695">Scoped_setter&lt;Value&gt;::~Scoped_setter</a>()</div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno">  226</span>{</div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno">  227</span>  <span class="keywordflow">if</span> (m_target_or_null)</div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno">  228</span>  {</div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno">  229</span>    *m_target_or_null = std::move(m_saved_value);</div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno">  230</span>  }</div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno">  231</span>  <span class="comment">// else { `*this` must have been moved-from.  No-op. }</span></div>
<div class="line"><a id="l00232" name="l00232"></a><span class="lineno">  232</span>}</div>
<div class="line"><a id="l00233" name="l00233"></a><span class="lineno">  233</span> </div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno">  234</span><span class="comment">// Free function template implementations.</span></div>
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno">  235</span> </div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno">  236</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Time_unit, <span class="keyword">typename</span> N_items&gt;</div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno"><a class="line" href="namespaceflow_1_1util.html#a0f681afaf67a0f917cf43a7ae893a015">  237</a></span><span class="keywordtype">double</span> <a class="code hl_function" href="namespaceflow_1_1util.html#a0f681afaf67a0f917cf43a7ae893a015">to_mbit_per_sec</a>(N_items items_per_time, <span class="keywordtype">size_t</span> bits_per_item)</div>
<div class="line"><a id="l00238" name="l00238"></a><span class="lineno">  238</span>{</div>
<div class="line"><a id="l00239" name="l00239"></a><span class="lineno">  239</span>  <span class="comment">/* Let there be U/W seconds per Time_unit.  Then the following holds:</span></div>
<div class="line"><a id="l00240" name="l00240"></a><span class="lineno">  240</span><span class="comment">   *</span></div>
<div class="line"><a id="l00241" name="l00241"></a><span class="lineno">  241</span><span class="comment">   * items_per_time items/Time_units * W/U Time_units/second * bits_per_item bits/item</span></div>
<div class="line"><a id="l00242" name="l00242"></a><span class="lineno">  242</span><span class="comment">   *   * 1/(1000*1000) megabits/bits</span></div>
<div class="line"><a id="l00243" name="l00243"></a><span class="lineno">  243</span><span class="comment">   *   = items_per_time * W / U * bits_per_item / 1000 / 1000 megabits/second.</span></div>
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno">  244</span><span class="comment">   *</span></div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno">  245</span><span class="comment">   * Notice the units work out.  W and U are conveniently available in Time_unit::period, which is a boost::ratio. */</span></div>
<div class="line"><a id="l00246" name="l00246"></a><span class="lineno">  246</span> </div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno">  247</span>  <span class="keywordflow">return</span></div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno">  248</span>    <span class="comment">/* This zealously converts everything to double ASAP to avoid overflow.  Could probably speed things up a bit</span></div>
<div class="line"><a id="l00249" name="l00249"></a><span class="lineno">  249</span><span class="comment">     * by postponing some of those conversions until after some integer multiplications, but then overflows could</span></div>
<div class="line"><a id="l00250" name="l00250"></a><span class="lineno">  250</span><span class="comment">     * creep in.  It&#39;s best not to assume too much about the values of den and num, as this function is meant to</span></div>
<div class="line"><a id="l00251" name="l00251"></a><span class="lineno">  251</span><span class="comment">     * be rather adaptable to various situations.  I did try to avoid unnecessary divisions though in favor of</span></div>
<div class="line"><a id="l00252" name="l00252"></a><span class="lineno">  252</span><span class="comment">     * multiplications, sort of guessing the latter are faster.  Or not... *shrug*. */</span></div>
<div class="line"><a id="l00253" name="l00253"></a><span class="lineno">  253</span>    double(items_per_time) * double(bits_per_item) * double(Time_unit::period::den)</div>
<div class="line"><a id="l00254" name="l00254"></a><span class="lineno">  254</span>    / (double(Time_unit::period::num) * double(1000 * 1000));</div>
<div class="line"><a id="l00255" name="l00255"></a><span class="lineno">  255</span>}</div>
<div class="line"><a id="l00256" name="l00256"></a><span class="lineno">  256</span> </div>
<div class="line"><a id="l00257" name="l00257"></a><span class="lineno">  257</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Integer&gt;</div>
<div class="line"><a id="l00258" name="l00258"></a><span class="lineno"><a class="line" href="namespaceflow_1_1util.html#a6b7316b3ed6d89f54c91e17c2aab101e">  258</a></span>Integer <a class="code hl_function" href="namespaceflow_1_1util.html#a6b7316b3ed6d89f54c91e17c2aab101e">ceil_div</a>(Integer dividend, Integer divisor)</div>
<div class="line"><a id="l00259" name="l00259"></a><span class="lineno">  259</span>{</div>
<div class="line"><a id="l00260" name="l00260"></a><span class="lineno">  260</span>  <span class="comment">// ceil(A : B) = (A + B - 1) / B, where : is floating point division, while / is integer division.</span></div>
<div class="line"><a id="l00261" name="l00261"></a><span class="lineno">  261</span>  <span class="keyword">static_assert</span>(std::is_integral_v&lt;Integer&gt;, <span class="stringliteral">&quot;ceil_div&lt;T&gt;: T must be an integer type.&quot;</span>);</div>
<div class="line"><a id="l00262" name="l00262"></a><span class="lineno">  262</span>  assert(dividend &gt;= 0);</div>
<div class="line"><a id="l00263" name="l00263"></a><span class="lineno">  263</span>  assert(divisor &gt; 0);</div>
<div class="line"><a id="l00264" name="l00264"></a><span class="lineno">  264</span> </div>
<div class="line"><a id="l00265" name="l00265"></a><span class="lineno">  265</span>  <span class="keywordflow">return</span> (dividend + divisor - 1) / divisor;</div>
<div class="line"><a id="l00266" name="l00266"></a><span class="lineno">  266</span>  <span class="comment">/* (Could one do further bitwise trickery?  Perhaps but let optimizer do it.  Wouldn&#39;t optimizer also just</span></div>
<div class="line"><a id="l00267" name="l00267"></a><span class="lineno">  267</span><span class="comment">   * optimize a literal floating-point `ceil(a / b)`?  Well, no.  Probably not.  So we wrote this function.) */</span></div>
<div class="line"><a id="l00268" name="l00268"></a><span class="lineno">  268</span>}</div>
<div class="line"><a id="l00269" name="l00269"></a><span class="lineno">  269</span> </div>
<div class="line"><a id="l00270" name="l00270"></a><span class="lineno">  270</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a id="l00271" name="l00271"></a><span class="lineno"><a class="line" href="namespaceflow_1_1util.html#ab10bc9e8bef148f875aa743fe0852743">  271</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="namespaceflow_1_1util.html#ab10bc9e8bef148f875aa743fe0852743">in_closed_range</a>(T <span class="keyword">const</span> &amp; min_val, T <span class="keyword">const</span> &amp; val, T <span class="keyword">const</span> &amp; max_val)</div>
<div class="line"><a id="l00272" name="l00272"></a><span class="lineno">  272</span>{</div>
<div class="line"><a id="l00273" name="l00273"></a><span class="lineno">  273</span>  <span class="comment">// This writes &quot;(min_val &lt;= val) &amp;&amp; (val &lt;= max_val)&quot; by using only &lt;, to support the greatest number of types.</span></div>
<div class="line"><a id="l00274" name="l00274"></a><span class="lineno">  274</span>  <span class="keywordflow">return</span> ((min_val &lt; val) || (!(val &lt; min_val))) &amp;&amp;</div>
<div class="line"><a id="l00275" name="l00275"></a><span class="lineno">  275</span>         ((val &lt; max_val) || (!(max_val &lt; val)));</div>
<div class="line"><a id="l00276" name="l00276"></a><span class="lineno">  276</span>}</div>
<div class="line"><a id="l00277" name="l00277"></a><span class="lineno">  277</span> </div>
<div class="line"><a id="l00278" name="l00278"></a><span class="lineno">  278</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a id="l00279" name="l00279"></a><span class="lineno"><a class="line" href="namespaceflow_1_1util.html#a8ae762ea4f743a98a73953d7f9ec2164">  279</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="namespaceflow_1_1util.html#a8ae762ea4f743a98a73953d7f9ec2164">in_open_closed_range</a>(T <span class="keyword">const</span> &amp; min_val, T <span class="keyword">const</span> &amp; val, T <span class="keyword">const</span> &amp; max_val)</div>
<div class="line"><a id="l00280" name="l00280"></a><span class="lineno">  280</span>{</div>
<div class="line"><a id="l00281" name="l00281"></a><span class="lineno">  281</span>  <span class="comment">// This writes &quot;(min_val &lt; val) &amp;&amp; (val &lt;= max_val)&quot; by using only &lt;, to support the greatest number of types.</span></div>
<div class="line"><a id="l00282" name="l00282"></a><span class="lineno">  282</span>  <span class="keywordflow">return</span> (min_val &lt; val) &amp;&amp;</div>
<div class="line"><a id="l00283" name="l00283"></a><span class="lineno">  283</span>         ((val &lt; max_val) || (!(max_val &lt; val)));</div>
<div class="line"><a id="l00284" name="l00284"></a><span class="lineno">  284</span>}</div>
<div class="line"><a id="l00285" name="l00285"></a><span class="lineno">  285</span> </div>
<div class="line"><a id="l00286" name="l00286"></a><span class="lineno">  286</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a id="l00287" name="l00287"></a><span class="lineno"><a class="line" href="namespaceflow_1_1util.html#a024ddda9acb2b66f2a1b35cdb0c016aa">  287</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="namespaceflow_1_1util.html#a024ddda9acb2b66f2a1b35cdb0c016aa">in_closed_open_range</a>(T <span class="keyword">const</span> &amp; min_val, T <span class="keyword">const</span> &amp; val, T <span class="keyword">const</span> &amp; max_val)</div>
<div class="line"><a id="l00288" name="l00288"></a><span class="lineno">  288</span>{</div>
<div class="line"><a id="l00289" name="l00289"></a><span class="lineno">  289</span>  <span class="comment">// This writes &quot;(val &lt; max_val) &amp;&amp; (min_val &lt;= val)&quot; by using only &lt;, to support the greatest number of types.</span></div>
<div class="line"><a id="l00290" name="l00290"></a><span class="lineno">  290</span>  <span class="keywordflow">return</span> (val &lt; max_val) &amp;&amp;</div>
<div class="line"><a id="l00291" name="l00291"></a><span class="lineno">  291</span>         ((min_val &lt; val) || (!(val &lt; min_val)));</div>
<div class="line"><a id="l00292" name="l00292"></a><span class="lineno">  292</span>}</div>
<div class="line"><a id="l00293" name="l00293"></a><span class="lineno">  293</span> </div>
<div class="line"><a id="l00294" name="l00294"></a><span class="lineno">  294</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a id="l00295" name="l00295"></a><span class="lineno"><a class="line" href="namespaceflow_1_1util.html#a733448fee07c2a77e343a3f1590ff82e">  295</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="namespaceflow_1_1util.html#a733448fee07c2a77e343a3f1590ff82e">in_open_open_range</a>(T <span class="keyword">const</span> &amp; min_val, T <span class="keyword">const</span> &amp; val, T <span class="keyword">const</span> &amp; max_val)</div>
<div class="line"><a id="l00296" name="l00296"></a><span class="lineno">  296</span>{</div>
<div class="line"><a id="l00297" name="l00297"></a><span class="lineno">  297</span>  <span class="keywordflow">return</span> (min_val &lt; val) &amp;&amp; (val &lt; max_val);</div>
<div class="line"><a id="l00298" name="l00298"></a><span class="lineno">  298</span>}</div>
<div class="line"><a id="l00299" name="l00299"></a><span class="lineno">  299</span> </div>
<div class="line"><a id="l00300" name="l00300"></a><span class="lineno">  300</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Container&gt;</div>
<div class="line"><a id="l00301" name="l00301"></a><span class="lineno"><a class="line" href="namespaceflow_1_1util.html#a03984e29450abf9cf287c501d6c8f866">  301</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="namespaceflow_1_1util.html#a03984e29450abf9cf287c501d6c8f866">key_exists</a>(<span class="keyword">const</span> Container&amp; container, <span class="keyword">const</span> <span class="keyword">typename</span> Container::key_type&amp; key)</div>
<div class="line"><a id="l00302" name="l00302"></a><span class="lineno">  302</span>{</div>
<div class="line"><a id="l00303" name="l00303"></a><span class="lineno">  303</span>  <span class="keywordflow">return</span> container.find(key) != container.end();</div>
<div class="line"><a id="l00304" name="l00304"></a><span class="lineno">  304</span>}</div>
<div class="line"><a id="l00305" name="l00305"></a><span class="lineno">  305</span> </div>
<div class="line"><a id="l00306" name="l00306"></a><span class="lineno">  306</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Cleanup_func&gt;</div>
<div class="line"><a id="l00307" name="l00307"></a><span class="lineno"><a class="line" href="namespaceflow_1_1util.html#a09a032f8e1e77a3afc0b7df115a773e1">  307</a></span><a class="code hl_typedef" href="namespaceflow_1_1util.html#ab22fd89e165a9e6deaa174bc0dfdc8de">Auto_cleanup</a> <a class="code hl_function" href="namespaceflow_1_1util.html#a09a032f8e1e77a3afc0b7df115a773e1">setup_auto_cleanup</a>(<span class="keyword">const</span> Cleanup_func&amp; func)</div>
<div class="line"><a id="l00308" name="l00308"></a><span class="lineno">  308</span>{</div>
<div class="line"><a id="l00309" name="l00309"></a><span class="lineno">  309</span>  <span class="comment">/* This trick, from shared_ptr or bind Boost docs (if I recall correctly), uses shared_ptr&#39;s deleter feature.  The</span></div>
<div class="line"><a id="l00310" name="l00310"></a><span class="lineno">  310</span><span class="comment">   * Auto_cleanup gains &quot;ownership&quot; of null pointer, purely for the purpose of running a deleter on it when the object</span></div>
<div class="line"><a id="l00311" name="l00311"></a><span class="lineno">  311</span><span class="comment">   * goes out of scope sometime later.  Deleting 0 itself would have been useless no-op, and instead we ignore the null</span></div>
<div class="line"><a id="l00312" name="l00312"></a><span class="lineno">  312</span><span class="comment">   * and simply call user&#39;s func(), which is what the goal is.</span></div>
<div class="line"><a id="l00313" name="l00313"></a><span class="lineno">  313</span><span class="comment">   *</span></div>
<div class="line"><a id="l00314" name="l00314"></a><span class="lineno">  314</span><span class="comment">   * Subtlety: shared_ptr docs say the passed-in deleter is saved by copy, so we needn&#39;t worry about it disappearing</span></div>
<div class="line"><a id="l00315" name="l00315"></a><span class="lineno">  315</span><span class="comment">   * after we return.</span></div>
<div class="line"><a id="l00316" name="l00316"></a><span class="lineno">  316</span><span class="comment">   *</span></div>
<div class="line"><a id="l00317" name="l00317"></a><span class="lineno">  317</span><span class="comment">   * Subtlety: we need to make a copy (via capture) of func, as there&#39;s zero guarantee (and low likelihood in practice)</span></div>
<div class="line"><a id="l00318" name="l00318"></a><span class="lineno">  318</span><span class="comment">   * that func is a valid object at the time cleanup is actually needed (sometime after we return). */</span></div>
<div class="line"><a id="l00319" name="l00319"></a><span class="lineno">  319</span>  <span class="keywordflow">return</span> <a class="code hl_typedef" href="namespaceflow_1_1util.html#ab22fd89e165a9e6deaa174bc0dfdc8de">Auto_cleanup</a>(<span class="keyword">static_cast&lt;</span><span class="keywordtype">void</span>*<span class="keyword">&gt;</span>(0),</div>
<div class="line"><a id="l00320" name="l00320"></a><span class="lineno">  320</span>                      [func](<span class="keywordtype">void</span>*) { func(); });</div>
<div class="line"><a id="l00321" name="l00321"></a><span class="lineno">  321</span>}</div>
<div class="line"><a id="l00322" name="l00322"></a><span class="lineno">  322</span> </div>
<div class="line"><a id="l00323" name="l00323"></a><span class="lineno">  323</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Minuend, <span class="keyword">typename</span> Subtrahend&gt;</div>
<div class="line"><a id="l00324" name="l00324"></a><span class="lineno"><a class="line" href="namespaceflow_1_1util.html#a34ed70fa4de81a4fdb9234bfb5a3a914">  324</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="namespaceflow_1_1util.html#a34ed70fa4de81a4fdb9234bfb5a3a914">subtract_with_floor</a>(Minuend* minuend, <span class="keyword">const</span> Subtrahend&amp; subtrahend, <span class="keyword">const</span> Minuend&amp; floor)</div>
<div class="line"><a id="l00325" name="l00325"></a><span class="lineno">  325</span>{</div>
<div class="line"><a id="l00326" name="l00326"></a><span class="lineno">  326</span>  assert(minuend);</div>
<div class="line"><a id="l00327" name="l00327"></a><span class="lineno">  327</span> </div>
<div class="line"><a id="l00328" name="l00328"></a><span class="lineno">  328</span>  <span class="comment">/* Basically just avoid implicit conversions and anything that mind overflow or underflow.</span></div>
<div class="line"><a id="l00329" name="l00329"></a><span class="lineno">  329</span><span class="comment">   * The one underflow we allow is the subtraction of `floor`: doc header says keep `floor` small.</span></div>
<div class="line"><a id="l00330" name="l00330"></a><span class="lineno">  330</span><span class="comment">   * So it&#39;s their problem if it&#39;s not. */</span></div>
<div class="line"><a id="l00331" name="l00331"></a><span class="lineno">  331</span> </div>
<div class="line"><a id="l00332" name="l00332"></a><span class="lineno">  332</span>  <span class="keyword">const</span> Minuend converted_subtrahend = Minuend(subtrahend);</div>
<div class="line"><a id="l00333" name="l00333"></a><span class="lineno">  333</span> </div>
<div class="line"><a id="l00334" name="l00334"></a><span class="lineno">  334</span>  <span class="comment">// min - sub &lt;= floor &lt;===&gt; min - floor &lt;= sub.</span></div>
<div class="line"><a id="l00335" name="l00335"></a><span class="lineno">  335</span>  <span class="keywordflow">if</span> ((*minuend - floor) &lt;= converted_subtrahend)</div>
<div class="line"><a id="l00336" name="l00336"></a><span class="lineno">  336</span>  {</div>
<div class="line"><a id="l00337" name="l00337"></a><span class="lineno">  337</span>    *minuend = floor;</div>
<div class="line"><a id="l00338" name="l00338"></a><span class="lineno">  338</span>    <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a id="l00339" name="l00339"></a><span class="lineno">  339</span>  }</div>
<div class="line"><a id="l00340" name="l00340"></a><span class="lineno">  340</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l00341" name="l00341"></a><span class="lineno">  341</span>  *minuend -= converted_subtrahend;</div>
<div class="line"><a id="l00342" name="l00342"></a><span class="lineno">  342</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a id="l00343" name="l00343"></a><span class="lineno">  343</span>}</div>
<div class="line"><a id="l00344" name="l00344"></a><span class="lineno">  344</span> </div>
<div class="line"><a id="l00345" name="l00345"></a><span class="lineno">  345</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> From, <span class="keyword">typename</span> To&gt;</div>
<div class="line"><a id="l00346" name="l00346"></a><span class="lineno"><a class="line" href="namespaceflow_1_1util.html#a67eecb5096dabfaff3d02c419b304540">  346</a></span><span class="keywordtype">size_t</span> <a class="code hl_function" href="namespaceflow_1_1util.html#a67eecb5096dabfaff3d02c419b304540">size_unit_convert</a>(From num_froms)</div>
<div class="line"><a id="l00347" name="l00347"></a><span class="lineno">  347</span>{</div>
<div class="line"><a id="l00348" name="l00348"></a><span class="lineno">  348</span>  <span class="keywordflow">return</span> ((num_froms * <span class="keyword">sizeof</span>(From)) + <span class="keyword">sizeof</span>(To) - 1) / <span class="keyword">sizeof</span>(To);</div>
<div class="line"><a id="l00349" name="l00349"></a><span class="lineno">  349</span>}</div>
<div class="line"><a id="l00350" name="l00350"></a><span class="lineno">  350</span> </div>
<div class="line"><a id="l00351" name="l00351"></a><span class="lineno">  351</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> T1, <span class="keyword">typename</span> ...T_rest&gt;</div>
<div class="line"><a id="l00352" name="l00352"></a><span class="lineno"><a class="line" href="namespaceflow_1_1util.html#af92e6183c2071f4166d4b5a91f50d70c">  352</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="namespaceflow_1_1util.html#af92e6183c2071f4166d4b5a91f50d70c">feed_args_to_ostream</a>(std::ostream* os, T1 <span class="keyword">const</span> &amp; ostream_arg1, T_rest <span class="keyword">const</span> &amp;... remaining_ostream_args)</div>
<div class="line"><a id="l00353" name="l00353"></a><span class="lineno">  353</span>{</div>
<div class="line"><a id="l00354" name="l00354"></a><span class="lineno">  354</span>  <span class="comment">// Induction step for variadic template.</span></div>
<div class="line"><a id="l00355" name="l00355"></a><span class="lineno">  355</span>  <a class="code hl_function" href="namespaceflow_1_1util.html#af92e6183c2071f4166d4b5a91f50d70c">feed_args_to_ostream</a>(os, ostream_arg1);</div>
<div class="line"><a id="l00356" name="l00356"></a><span class="lineno">  356</span>  <a class="code hl_function" href="namespaceflow_1_1util.html#af92e6183c2071f4166d4b5a91f50d70c">feed_args_to_ostream</a>(os, remaining_ostream_args...);</div>
<div class="line"><a id="l00357" name="l00357"></a><span class="lineno">  357</span>}</div>
<div class="line"><a id="l00358" name="l00358"></a><span class="lineno">  358</span> </div>
<div class="line"><a id="l00359" name="l00359"></a><span class="lineno">  359</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a id="l00360" name="l00360"></a><span class="lineno"><a class="line" href="namespaceflow_1_1util.html#a3ce0e3794a3a84dd26b4aa7b013f6276">  360</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="namespaceflow_1_1util.html#af92e6183c2071f4166d4b5a91f50d70c">feed_args_to_ostream</a>(std::ostream* os, T <span class="keyword">const</span> &amp; only_ostream_arg)</div>
<div class="line"><a id="l00361" name="l00361"></a><span class="lineno">  361</span>{</div>
<div class="line"><a id="l00362" name="l00362"></a><span class="lineno">  362</span>  <span class="comment">// Induction base.</span></div>
<div class="line"><a id="l00363" name="l00363"></a><span class="lineno">  363</span>  *os &lt;&lt; only_ostream_arg;</div>
<div class="line"><a id="l00364" name="l00364"></a><span class="lineno">  364</span>}</div>
<div class="line"><a id="l00365" name="l00365"></a><span class="lineno">  365</span> </div>
<div class="line"><a id="l00366" name="l00366"></a><span class="lineno">  366</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> ...T&gt;</div>
<div class="line"><a id="l00367" name="l00367"></a><span class="lineno"><a class="line" href="namespaceflow_1_1util.html#a8afd30c50bcd670d45442df49d1da484">  367</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="namespaceflow_1_1util.html#a8afd30c50bcd670d45442df49d1da484">ostream_op_to_string</a>(std::string* target_str, T <span class="keyword">const</span> &amp;... ostream_args)</div>
<div class="line"><a id="l00368" name="l00368"></a><span class="lineno">  368</span>{</div>
<div class="line"><a id="l00369" name="l00369"></a><span class="lineno">  369</span>  <span class="keyword">using </span>std::flush;</div>
<div class="line"><a id="l00370" name="l00370"></a><span class="lineno">  370</span> </div>
<div class="line"><a id="l00371" name="l00371"></a><span class="lineno">  371</span>  <span class="comment">/* Pushes characters directly onto an `std::string`, instead of doing so into an `ostringstream` and then getting it</span></div>
<div class="line"><a id="l00372" name="l00372"></a><span class="lineno">  372</span><span class="comment">   * by copy via `ostringstream::copy()`.  This is for performance and may make a large difference</span></div>
<div class="line"><a id="l00373" name="l00373"></a><span class="lineno">  373</span><span class="comment">   * overall, if this is used in logging for example.  However, Thread_local_string_appender accomplishes</span></div>
<div class="line"><a id="l00374" name="l00374"></a><span class="lineno">  374</span><span class="comment">   * better performance still and some other features. */</span></div>
<div class="line"><a id="l00375" name="l00375"></a><span class="lineno">  375</span>  <a class="code hl_class" href="classflow_1_1util_1_1String__ostream.html">String_ostream</a> os(target_str);</div>
<div class="line"><a id="l00376" name="l00376"></a><span class="lineno">  376</span>  <a class="code hl_function" href="namespaceflow_1_1util.html#af92e6183c2071f4166d4b5a91f50d70c">feed_args_to_ostream</a>(&amp;(os.<a class="code hl_function" href="classflow_1_1util_1_1String__ostream.html#a7e64b069ae0e221952068c13fdc0f080">os</a>()), ostream_args...);</div>
<div class="line"><a id="l00377" name="l00377"></a><span class="lineno">  377</span>  os.<a class="code hl_function" href="classflow_1_1util_1_1String__ostream.html#a7e64b069ae0e221952068c13fdc0f080">os</a>() &lt;&lt; flush;</div>
<div class="line"><a id="l00378" name="l00378"></a><span class="lineno">  378</span>}</div>
<div class="line"><a id="l00379" name="l00379"></a><span class="lineno">  379</span> </div>
<div class="line"><a id="l00380" name="l00380"></a><span class="lineno">  380</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> ...T&gt;</div>
<div class="line"><a id="l00381" name="l00381"></a><span class="lineno"><a class="line" href="namespaceflow_1_1util.html#a685b86585da2fa5186f51854e7ae1561">  381</a></span>std::string <a class="code hl_function" href="namespaceflow_1_1util.html#a685b86585da2fa5186f51854e7ae1561">ostream_op_string</a>(T <span class="keyword">const</span> &amp;... ostream_args)</div>
<div class="line"><a id="l00382" name="l00382"></a><span class="lineno">  382</span>{</div>
<div class="line"><a id="l00383" name="l00383"></a><span class="lineno">  383</span>  <span class="keyword">using </span>std::string;</div>
<div class="line"><a id="l00384" name="l00384"></a><span class="lineno">  384</span> </div>
<div class="line"><a id="l00385" name="l00385"></a><span class="lineno">  385</span>  <span class="keywordtype">string</span> result;</div>
<div class="line"><a id="l00386" name="l00386"></a><span class="lineno">  386</span>  <a class="code hl_function" href="namespaceflow_1_1util.html#a8afd30c50bcd670d45442df49d1da484">ostream_op_to_string</a>(&amp;result, ostream_args...);</div>
<div class="line"><a id="l00387" name="l00387"></a><span class="lineno">  387</span>  <span class="keywordflow">return</span> result;</div>
<div class="line"><a id="l00388" name="l00388"></a><span class="lineno">  388</span>}</div>
<div class="line"><a id="l00389" name="l00389"></a><span class="lineno">  389</span> </div>
<div class="line"><a id="l00390" name="l00390"></a><span class="lineno">  390</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Map, <span class="keyword">typename</span> Sequence&gt;</div>
<div class="line"><a id="l00391" name="l00391"></a><span class="lineno"><a class="line" href="namespaceflow_1_1util.html#a0a873d1abeac7a29822e940adf4f06c9">  391</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="namespaceflow_1_1util.html#a0a873d1abeac7a29822e940adf4f06c9">sequence_to_inverted_lookup_map</a></div>
<div class="line"><a id="l00392" name="l00392"></a><span class="lineno">  392</span>       (Sequence <span class="keyword">const</span> &amp; src_seq, Map* target_map,</div>
<div class="line"><a id="l00393" name="l00393"></a><span class="lineno">  393</span>        <span class="keyword">const</span> <a class="code hl_class" href="classflow_1_1Function.html">Function</a>&lt;<span class="keyword">typename</span> Map::mapped_type (<span class="keywordtype">size_t</span>)&gt;&amp; idx_to_map_val_func)</div>
<div class="line"><a id="l00394" name="l00394"></a><span class="lineno">  394</span>{</div>
<div class="line"><a id="l00395" name="l00395"></a><span class="lineno">  395</span>  <span class="keywordtype">size_t</span> idx = 0;</div>
<div class="line"><a id="l00396" name="l00396"></a><span class="lineno">  396</span>  <span class="keywordflow">for</span> (<span class="keyword">const</span> <span class="keyword">auto</span>&amp; src_element : src_seq)</div>
<div class="line"><a id="l00397" name="l00397"></a><span class="lineno">  397</span>  {</div>
<div class="line"><a id="l00398" name="l00398"></a><span class="lineno">  398</span>    (*target_map)[src_element] = idx_to_map_val_func(idx);</div>
<div class="line"><a id="l00399" name="l00399"></a><span class="lineno">  399</span>    ++idx;</div>
<div class="line"><a id="l00400" name="l00400"></a><span class="lineno">  400</span>  }</div>
<div class="line"><a id="l00401" name="l00401"></a><span class="lineno">  401</span>}</div>
<div class="line"><a id="l00402" name="l00402"></a><span class="lineno">  402</span> </div>
<div class="line"><a id="l00403" name="l00403"></a><span class="lineno">  403</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Map, <span class="keyword">typename</span> Sequence&gt;</div>
<div class="line"><a id="l00404" name="l00404"></a><span class="lineno"><a class="line" href="namespaceflow_1_1util.html#a002c9a2f7629dfe3fdfa5632eda30dbd">  404</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="namespaceflow_1_1util.html#a0a873d1abeac7a29822e940adf4f06c9">sequence_to_inverted_lookup_map</a>(Sequence <span class="keyword">const</span> &amp; src_seq, Map* target_map)</div>
<div class="line"><a id="l00405" name="l00405"></a><span class="lineno">  405</span>{</div>
<div class="line"><a id="l00406" name="l00406"></a><span class="lineno">  406</span>  <a class="code hl_function" href="namespaceflow_1_1util.html#a0a873d1abeac7a29822e940adf4f06c9">sequence_to_inverted_lookup_map</a>(src_seq, target_map, [](<span class="keywordtype">size_t</span> idx) -&gt; <span class="keywordtype">size_t</span></div>
<div class="line"><a id="l00407" name="l00407"></a><span class="lineno">  407</span>  {</div>
<div class="line"><a id="l00408" name="l00408"></a><span class="lineno">  408</span>    <span class="keywordflow">return</span> idx;</div>
<div class="line"><a id="l00409" name="l00409"></a><span class="lineno">  409</span>  });</div>
<div class="line"><a id="l00410" name="l00410"></a><span class="lineno">  410</span>}</div>
<div class="line"><a id="l00411" name="l00411"></a><span class="lineno">  411</span> </div>
<div class="line"><a id="l00412" name="l00412"></a><span class="lineno">  412</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Const_buffer_sequence&gt;</div>
<div class="line"><a id="l00413" name="l00413"></a><span class="lineno"><a class="line" href="namespaceflow_1_1util.html#aa132928b364caefca5c3821e019924bf">  413</a></span>std::ostream&amp; <a class="code hl_function" href="namespaceflow_1_1util.html#aa132928b364caefca5c3821e019924bf">buffers_to_ostream</a>(std::ostream&amp; os,</div>
<div class="line"><a id="l00414" name="l00414"></a><span class="lineno">  414</span>                                 <span class="keyword">const</span> Const_buffer_sequence&amp; data,</div>
<div class="line"><a id="l00415" name="l00415"></a><span class="lineno">  415</span>                                 <span class="keyword">const</span> std::string&amp; indentation,</div>
<div class="line"><a id="l00416" name="l00416"></a><span class="lineno">  416</span>                                 <span class="keywordtype">size_t</span> bytes_per_line)</div>
<div class="line"><a id="l00417" name="l00417"></a><span class="lineno">  417</span>{</div>
<div class="line"><a id="l00418" name="l00418"></a><span class="lineno">  418</span>  <span class="keyword">using </span>boost::io::ios_fill_saver;</div>
<div class="line"><a id="l00419" name="l00419"></a><span class="lineno">  419</span>  <span class="keyword">using </span>boost::io::ios_flags_saver;</div>
<div class="line"><a id="l00420" name="l00420"></a><span class="lineno">  420</span>  <span class="keyword">using </span>boost::io::ios_width_saver;</div>
<div class="line"><a id="l00421" name="l00421"></a><span class="lineno">  421</span>  <span class="keyword">using </span>boost::asio::buffers_iterator;</div>
<div class="line"><a id="l00422" name="l00422"></a><span class="lineno">  422</span>  <span class="keyword">using </span>std::isprint;</div>
<div class="line"><a id="l00423" name="l00423"></a><span class="lineno">  423</span> </div>
<div class="line"><a id="l00424" name="l00424"></a><span class="lineno">  424</span>  <span class="comment">/* This sweet type will iterate over the buffer sequence (jumping between contained buffers, if ther are &gt; 1).</span></div>
<div class="line"><a id="l00425" name="l00425"></a><span class="lineno">  425</span><span class="comment">   * If `Bufs_iter it`, then *it is of type uint8_t. */</span></div>
<div class="line"><a id="l00426" name="l00426"></a><span class="lineno">  426</span>  <span class="keyword">using </span>Bufs_iter = buffers_iterator&lt;Const_buffer_sequence, uint8_t&gt;;</div>
<div class="line"><a id="l00427" name="l00427"></a><span class="lineno">  427</span> </div>
<div class="line"><a id="l00428" name="l00428"></a><span class="lineno">  428</span>  <span class="keyword">constexpr</span> <span class="keywordtype">size_t</span> BYTES_PER_LINE_DEFAULT = 16;</div>
<div class="line"><a id="l00429" name="l00429"></a><span class="lineno">  429</span>  <span class="keywordtype">bool</span> single_line_mode = <span class="keyword">false</span>;</div>
<div class="line"><a id="l00430" name="l00430"></a><span class="lineno">  430</span>  <span class="keywordflow">if</span> (bytes_per_line == 0)</div>
<div class="line"><a id="l00431" name="l00431"></a><span class="lineno">  431</span>  {</div>
<div class="line"><a id="l00432" name="l00432"></a><span class="lineno">  432</span>    bytes_per_line = BYTES_PER_LINE_DEFAULT;</div>
<div class="line"><a id="l00433" name="l00433"></a><span class="lineno">  433</span>  }</div>
<div class="line"><a id="l00434" name="l00434"></a><span class="lineno">  434</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (bytes_per_line == <span class="keywordtype">size_t</span>(-1))</div>
<div class="line"><a id="l00435" name="l00435"></a><span class="lineno">  435</span>  {</div>
<div class="line"><a id="l00436" name="l00436"></a><span class="lineno">  436</span>    <span class="comment">/* Firstly just pretend exactly the bytes in the whole input = &quot;max&quot; bytes per line.</span></div>
<div class="line"><a id="l00437" name="l00437"></a><span class="lineno">  437</span><span class="comment">     * This accomplishes the bulk of what &quot;single-line mode&quot; means. */</span></div>
<div class="line"><a id="l00438" name="l00438"></a><span class="lineno">  438</span>    bytes_per_line = buffer_size(data);</div>
<div class="line"><a id="l00439" name="l00439"></a><span class="lineno">  439</span>    <span class="comment">// A bit slow potentially to need to enumerate all scattered buffers.  Eh.  Contract said we should be assumed slow.</span></div>
<div class="line"><a id="l00440" name="l00440"></a><span class="lineno">  440</span> </div>
<div class="line"><a id="l00441" name="l00441"></a><span class="lineno">  441</span>    <span class="comment">// The rest of what it means is lacking a newline at the end in single-line mode.  So just remember that part.</span></div>
<div class="line"><a id="l00442" name="l00442"></a><span class="lineno">  442</span>    single_line_mode = <span class="keyword">true</span>;</div>
<div class="line"><a id="l00443" name="l00443"></a><span class="lineno">  443</span>  }</div>
<div class="line"><a id="l00444" name="l00444"></a><span class="lineno">  444</span> </div>
<div class="line"><a id="l00445" name="l00445"></a><span class="lineno">  445</span>  <span class="comment">// Ensure format settings return to their previous values subsequently.</span></div>
<div class="line"><a id="l00446" name="l00446"></a><span class="lineno">  446</span>  ios_flags_saver flags_saver(os);</div>
<div class="line"><a id="l00447" name="l00447"></a><span class="lineno">  447</span>  ios_fill_saver fill_saver(os);</div>
<div class="line"><a id="l00448" name="l00448"></a><span class="lineno">  448</span>  ios_width_saver width_saver(os);</div>
<div class="line"><a id="l00449" name="l00449"></a><span class="lineno">  449</span> </div>
<div class="line"><a id="l00450" name="l00450"></a><span class="lineno">  450</span>  <span class="comment">/* Set formatting and output numeric value (hex) of first byte.</span></div>
<div class="line"><a id="l00451" name="l00451"></a><span class="lineno">  451</span><span class="comment">   * @todo Is there a way to write this with manipulators too? */</span></div>
<div class="line"><a id="l00452" name="l00452"></a><span class="lineno">  452</span>  os.setf(std::ios::right | std::ios::hex, std::ios::adjustfield | std::ios::basefield);</div>
<div class="line"><a id="l00453" name="l00453"></a><span class="lineno">  453</span>  os &lt;&lt; std::setfill(<span class="charliteral">&#39;0&#39;</span>);</div>
<div class="line"><a id="l00454" name="l00454"></a><span class="lineno">  454</span> </div>
<div class="line"><a id="l00455" name="l00455"></a><span class="lineno">  455</span>  <span class="keyword">const</span> Bufs_iter end_byte_it = Bufs_iter::end(data);</div>
<div class="line"><a id="l00456" name="l00456"></a><span class="lineno">  456</span> </div>
<div class="line"><a id="l00457" name="l00457"></a><span class="lineno">  457</span>  <span class="keywordflow">for</span> (Bufs_iter cur_byte_it = Bufs_iter::begin(data);</div>
<div class="line"><a id="l00458" name="l00458"></a><span class="lineno">  458</span>       cur_byte_it != end_byte_it;</div>
<div class="line"><a id="l00459" name="l00459"></a><span class="lineno">  459</span>       <span class="comment">/* Advancing of cur_byte_it occurs within body of loop. */</span>)</div>
<div class="line"><a id="l00460" name="l00460"></a><span class="lineno">  460</span>  {</div>
<div class="line"><a id="l00461" name="l00461"></a><span class="lineno">  461</span>    <span class="comment">// The for() loop around us guarantees there is at least this first byte.  Print the numeric value.</span></div>
<div class="line"><a id="l00462" name="l00462"></a><span class="lineno">  462</span>    os &lt;&lt; indentation &lt;&lt; <span class="charliteral">&#39;[&#39;</span></div>
<div class="line"><a id="l00463" name="l00463"></a><span class="lineno">  463</span>       &lt;&lt; std::setw(2) &lt;&lt; int(*cur_byte_it); <span class="comment">// Numeric value in hex.</span></div>
<div class="line"><a id="l00464" name="l00464"></a><span class="lineno">  464</span> </div>
<div class="line"><a id="l00465" name="l00465"></a><span class="lineno">  465</span>    <span class="comment">// Repeat for remaining bytes left in this line.  Stop at bytes/line limit, or if reached end of buffers.</span></div>
<div class="line"><a id="l00466" name="l00466"></a><span class="lineno">  466</span>    <span class="keywordtype">size_t</span> n_bytes_printed;</div>
<div class="line"><a id="l00467" name="l00467"></a><span class="lineno">  467</span>    <span class="keywordflow">for</span> ((n_bytes_printed = 1), ++cur_byte_it; <span class="comment">// Account for printing that first byte above.</span></div>
<div class="line"><a id="l00468" name="l00468"></a><span class="lineno">  468</span>         (n_bytes_printed != bytes_per_line) &amp;&amp; (cur_byte_it != end_byte_it);</div>
<div class="line"><a id="l00469" name="l00469"></a><span class="lineno">  469</span>         ++cur_byte_it, ++n_bytes_printed)</div>
<div class="line"><a id="l00470" name="l00470"></a><span class="lineno">  470</span>    {</div>
<div class="line"><a id="l00471" name="l00471"></a><span class="lineno">  471</span>      os &lt;&lt; <span class="charliteral">&#39; &#39;</span> &lt;&lt; std::setw(2) &lt;&lt; int(*cur_byte_it); <span class="comment">// Numeric value in hex.</span></div>
<div class="line"><a id="l00472" name="l00472"></a><span class="lineno">  472</span>    }</div>
<div class="line"><a id="l00473" name="l00473"></a><span class="lineno">  473</span> </div>
<div class="line"><a id="l00474" name="l00474"></a><span class="lineno">  474</span>    <span class="comment">// Spaces as if rest of line still had a few ghost values to print (space + 2 spaces for the hex digits).</span></div>
<div class="line"><a id="l00475" name="l00475"></a><span class="lineno">  475</span>    <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> n_bytes_printed_including_padding = n_bytes_printed;</div>
<div class="line"><a id="l00476" name="l00476"></a><span class="lineno">  476</span>         n_bytes_printed_including_padding != bytes_per_line;</div>
<div class="line"><a id="l00477" name="l00477"></a><span class="lineno">  477</span>         ++n_bytes_printed_including_padding)</div>
<div class="line"><a id="l00478" name="l00478"></a><span class="lineno">  478</span>    {</div>
<div class="line"><a id="l00479" name="l00479"></a><span class="lineno">  479</span>      os &lt;&lt; <span class="stringliteral">&quot;   &quot;</span>;</div>
<div class="line"><a id="l00480" name="l00480"></a><span class="lineno">  480</span>    }</div>
<div class="line"><a id="l00481" name="l00481"></a><span class="lineno">  481</span> </div>
<div class="line"><a id="l00482" name="l00482"></a><span class="lineno">  482</span>    <span class="comment">// Backtrack and print those same bytes -- this time as printable characters (when printable, else dots).</span></div>
<div class="line"><a id="l00483" name="l00483"></a><span class="lineno">  483</span>    cur_byte_it -= n_bytes_printed;</div>
<div class="line"><a id="l00484" name="l00484"></a><span class="lineno">  484</span> </div>
<div class="line"><a id="l00485" name="l00485"></a><span class="lineno">  485</span>    os &lt;&lt; <span class="charliteral">&#39;|&#39;</span>;</div>
<div class="line"><a id="l00486" name="l00486"></a><span class="lineno">  486</span>    <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> n_chars_printed = 0;</div>
<div class="line"><a id="l00487" name="l00487"></a><span class="lineno">  487</span>         n_chars_printed != n_bytes_printed;</div>
<div class="line"><a id="l00488" name="l00488"></a><span class="lineno">  488</span>         ++cur_byte_it, ++n_chars_printed)</div>
<div class="line"><a id="l00489" name="l00489"></a><span class="lineno">  489</span>    {</div>
<div class="line"><a id="l00490" name="l00490"></a><span class="lineno">  490</span>      <span class="keywordtype">char</span> c = *cur_byte_it;</div>
<div class="line"><a id="l00491" name="l00491"></a><span class="lineno">  491</span>      os &lt;&lt; (isprint(c) ? c : <span class="charliteral">&#39;.&#39;</span>);</div>
<div class="line"><a id="l00492" name="l00492"></a><span class="lineno">  492</span>    }</div>
<div class="line"><a id="l00493" name="l00493"></a><span class="lineno">  493</span>    os &lt;&lt; <span class="charliteral">&#39;]&#39;</span>;</div>
<div class="line"><a id="l00494" name="l00494"></a><span class="lineno">  494</span>    <span class="keywordflow">if</span> (!single_line_mode)</div>
<div class="line"><a id="l00495" name="l00495"></a><span class="lineno">  495</span>    {</div>
<div class="line"><a id="l00496" name="l00496"></a><span class="lineno">  496</span>      os &lt;&lt; <span class="charliteral">&#39;\n&#39;</span>;</div>
<div class="line"><a id="l00497" name="l00497"></a><span class="lineno">  497</span>    }</div>
<div class="line"><a id="l00498" name="l00498"></a><span class="lineno">  498</span>  } <span class="comment">// for (cur_byte_it)</span></div>
<div class="line"><a id="l00499" name="l00499"></a><span class="lineno">  499</span> </div>
<div class="line"><a id="l00500" name="l00500"></a><span class="lineno">  500</span>  <span class="keywordflow">return</span> os;</div>
<div class="line"><a id="l00501" name="l00501"></a><span class="lineno">  501</span> </div>
<div class="line"><a id="l00502" name="l00502"></a><span class="lineno">  502</span>  <span class="comment">// The formatting changes will be restored here as the savers exit scope.</span></div>
<div class="line"><a id="l00503" name="l00503"></a><span class="lineno">  503</span>} <span class="comment">// buffers_to_ostream()</span></div>
<div class="line"><a id="l00504" name="l00504"></a><span class="lineno">  504</span> </div>
<div class="line"><a id="l00505" name="l00505"></a><span class="lineno">  505</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Const_buffer_sequence&gt;</div>
<div class="line"><a id="l00506" name="l00506"></a><span class="lineno"><a class="line" href="namespaceflow_1_1util.html#a16357344c21456b86b7de3085e2661a2">  506</a></span>std::string <a class="code hl_function" href="namespaceflow_1_1util.html#a16357344c21456b86b7de3085e2661a2">buffers_dump_string</a>(<span class="keyword">const</span> Const_buffer_sequence&amp; data, <span class="keyword">const</span> std::string&amp; indentation,</div>
<div class="line"><a id="l00507" name="l00507"></a><span class="lineno">  507</span>                                <span class="keywordtype">size_t</span> bytes_per_line)</div>
<div class="line"><a id="l00508" name="l00508"></a><span class="lineno">  508</span>{</div>
<div class="line"><a id="l00509" name="l00509"></a><span class="lineno">  509</span>  <span class="keyword">using </span>std::flush;</div>
<div class="line"><a id="l00510" name="l00510"></a><span class="lineno">  510</span>  <span class="keyword">using </span>std::string;</div>
<div class="line"><a id="l00511" name="l00511"></a><span class="lineno">  511</span> </div>
<div class="line"><a id="l00512" name="l00512"></a><span class="lineno">  512</span>  <span class="comment">// See comment in ostream_op_to_string() which applies here too (re. perf).</span></div>
<div class="line"><a id="l00513" name="l00513"></a><span class="lineno">  513</span> </div>
<div class="line"><a id="l00514" name="l00514"></a><span class="lineno">  514</span>  <span class="keywordtype">string</span> target_str;</div>
<div class="line"><a id="l00515" name="l00515"></a><span class="lineno">  515</span>  <a class="code hl_class" href="classflow_1_1util_1_1String__ostream.html">String_ostream</a> os(&amp;target_str);</div>
<div class="line"><a id="l00516" name="l00516"></a><span class="lineno">  516</span>  <a class="code hl_function" href="namespaceflow_1_1util.html#aa132928b364caefca5c3821e019924bf">buffers_to_ostream</a>(os.<a class="code hl_function" href="classflow_1_1util_1_1String__ostream.html#a7e64b069ae0e221952068c13fdc0f080">os</a>(), data, indentation, bytes_per_line);</div>
<div class="line"><a id="l00517" name="l00517"></a><span class="lineno">  517</span>  os.<a class="code hl_function" href="classflow_1_1util_1_1String__ostream.html#a7e64b069ae0e221952068c13fdc0f080">os</a>() &lt;&lt; flush;</div>
<div class="line"><a id="l00518" name="l00518"></a><span class="lineno">  518</span> </div>
<div class="line"><a id="l00519" name="l00519"></a><span class="lineno">  519</span>  <span class="keywordflow">return</span> target_str;</div>
<div class="line"><a id="l00520" name="l00520"></a><span class="lineno">  520</span>}</div>
<div class="line"><a id="l00521" name="l00521"></a><span class="lineno">  521</span> </div>
<div class="line"><a id="l00522" name="l00522"></a><span class="lineno">  522</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Enum&gt;</div>
<div class="line"><a id="l00523" name="l00523"></a><span class="lineno"><a class="line" href="namespaceflow_1_1util.html#a18a29d6a6e65c3b96c52b5cad5971266">  523</a></span>Enum <a class="code hl_function" href="namespaceflow_1_1util.html#a18a29d6a6e65c3b96c52b5cad5971266">istream_to_enum</a>(std::istream* is_ptr, Enum enum_default, Enum enum_sentinel,</div>
<div class="line"><a id="l00524" name="l00524"></a><span class="lineno">  524</span>                     <span class="keywordtype">bool</span> accept_num_encoding, <span class="keywordtype">bool</span> case_sensitive,</div>
<div class="line"><a id="l00525" name="l00525"></a><span class="lineno">  525</span>                     Enum enum_lowest)</div>
<div class="line"><a id="l00526" name="l00526"></a><span class="lineno">  526</span>{</div>
<div class="line"><a id="l00527" name="l00527"></a><span class="lineno">  527</span>  <span class="keyword">using </span>boost::lexical_cast;</div>
<div class="line"><a id="l00528" name="l00528"></a><span class="lineno">  528</span>  <span class="keyword">using </span>boost::bad_lexical_cast;</div>
<div class="line"><a id="l00529" name="l00529"></a><span class="lineno">  529</span>  <span class="keyword">using </span>boost::algorithm::equals;</div>
<div class="line"><a id="l00530" name="l00530"></a><span class="lineno">  530</span>  <span class="keyword">using </span>boost::algorithm::is_iequal;</div>
<div class="line"><a id="l00531" name="l00531"></a><span class="lineno">  531</span>  <span class="keyword">using </span>std::locale;</div>
<div class="line"><a id="l00532" name="l00532"></a><span class="lineno">  532</span>  <span class="keyword">using </span>std::string;</div>
<div class="line"><a id="l00533" name="l00533"></a><span class="lineno">  533</span>  <span class="keyword">using </span>std::isdigit;</div>
<div class="line"><a id="l00534" name="l00534"></a><span class="lineno">  534</span>  <span class="keyword">using </span>std::isalnum;</div>
<div class="line"><a id="l00535" name="l00535"></a><span class="lineno">  535</span>  <span class="keyword">using </span>Traits = std::char_traits&lt;char&gt;;</div>
<div class="line"><a id="l00536" name="l00536"></a><span class="lineno">  536</span>  <span class="keyword">using </span>enum_t = std::underlying_type_t&lt;Enum&gt;;</div>
<div class="line"><a id="l00537" name="l00537"></a><span class="lineno">  537</span> </div>
<div class="line"><a id="l00538" name="l00538"></a><span class="lineno">  538</span>  <span class="comment">// Reminder: There are various assumptions about Enum this takes for granted; behavior undefined otherwise.</span></div>
<div class="line"><a id="l00539" name="l00539"></a><span class="lineno">  539</span> </div>
<div class="line"><a id="l00540" name="l00540"></a><span class="lineno">  540</span>  assert(enum_t(enum_lowest) &gt;= 0); <span class="comment">// Otherwise we&#39;d have to allow &#39;-&#39; (minus sign), and we&#39;d... just rather not.</span></div>
<div class="line"><a id="l00541" name="l00541"></a><span class="lineno">  541</span>  <span class="keyword">auto</span>&amp; is = *is_ptr;</div>
<div class="line"><a id="l00542" name="l00542"></a><span class="lineno">  542</span>  <span class="keyword">const</span> is_iequal i_equal_func(locale::classic());</div>
<div class="line"><a id="l00543" name="l00543"></a><span class="lineno">  543</span> </div>
<div class="line"><a id="l00544" name="l00544"></a><span class="lineno">  544</span>  <span class="comment">// Read into `token` until (and not including) the first non-alphanumeric/underscore character or stream end.</span></div>
<div class="line"><a id="l00545" name="l00545"></a><span class="lineno">  545</span>  <span class="keywordtype">string</span> token;</div>
<div class="line"><a id="l00546" name="l00546"></a><span class="lineno">  546</span>  <span class="keywordtype">char</span> ch;</div>
<div class="line"><a id="l00547" name="l00547"></a><span class="lineno">  547</span>  <span class="keywordflow">while</span> (((ch = is.peek()) != Traits::eof()) &amp;&amp; (isalnum(ch) || (ch == <span class="charliteral">&#39;_&#39;</span>)))</div>
<div class="line"><a id="l00548" name="l00548"></a><span class="lineno">  548</span>  {</div>
<div class="line"><a id="l00549" name="l00549"></a><span class="lineno">  549</span>    token += ch;</div>
<div class="line"><a id="l00550" name="l00550"></a><span class="lineno">  550</span>    is.get();</div>
<div class="line"><a id="l00551" name="l00551"></a><span class="lineno">  551</span>  }</div>
<div class="line"><a id="l00552" name="l00552"></a><span class="lineno">  552</span> </div>
<div class="line"><a id="l00553" name="l00553"></a><span class="lineno">  553</span>  Enum val = enum_default;</div>
<div class="line"><a id="l00554" name="l00554"></a><span class="lineno">  554</span> </div>
<div class="line"><a id="l00555" name="l00555"></a><span class="lineno">  555</span>  <span class="keywordflow">if</span> (!token.empty())</div>
<div class="line"><a id="l00556" name="l00556"></a><span class="lineno">  556</span>  {</div>
<div class="line"><a id="l00557" name="l00557"></a><span class="lineno">  557</span>    <span class="keywordflow">if</span> (accept_num_encoding &amp;&amp; isdigit(token.front())) <span class="comment">// Hence ostream&lt;&lt; shouldn&#39;t serialize a digit-leading value.</span></div>
<div class="line"><a id="l00558" name="l00558"></a><span class="lineno">  558</span>    {</div>
<div class="line"><a id="l00559" name="l00559"></a><span class="lineno">  559</span>      enum_t num_enum;</div>
<div class="line"><a id="l00560" name="l00560"></a><span class="lineno">  560</span>      <span class="keywordflow">try</span></div>
<div class="line"><a id="l00561" name="l00561"></a><span class="lineno">  561</span>      {</div>
<div class="line"><a id="l00562" name="l00562"></a><span class="lineno">  562</span>        num_enum = lexical_cast&lt;enum_t&gt;(token);</div>
<div class="line"><a id="l00563" name="l00563"></a><span class="lineno">  563</span>        <span class="comment">// This assumes a vanilla enum integer value ordering.</span></div>
<div class="line"><a id="l00564" name="l00564"></a><span class="lineno">  564</span>        <span class="keywordflow">if</span> ((num_enum &gt;= enum_t(enum_sentinel) || (num_enum &lt; enum_t(enum_lowest))))</div>
<div class="line"><a id="l00565" name="l00565"></a><span class="lineno">  565</span>        {</div>
<div class="line"><a id="l00566" name="l00566"></a><span class="lineno">  566</span>          num_enum = enum_t(enum_default);</div>
<div class="line"><a id="l00567" name="l00567"></a><span class="lineno">  567</span>        }</div>
<div class="line"><a id="l00568" name="l00568"></a><span class="lineno">  568</span>        val = Enum(num_enum);</div>
<div class="line"><a id="l00569" name="l00569"></a><span class="lineno">  569</span>      }</div>
<div class="line"><a id="l00570" name="l00570"></a><span class="lineno">  570</span>      <span class="keywordflow">catch</span> (<span class="keyword">const</span> bad_lexical_cast&amp; exc)</div>
<div class="line"><a id="l00571" name="l00571"></a><span class="lineno">  571</span>      {</div>
<div class="line"><a id="l00572" name="l00572"></a><span class="lineno">  572</span>        assert(val == enum_default);</div>
<div class="line"><a id="l00573" name="l00573"></a><span class="lineno">  573</span>      }</div>
<div class="line"><a id="l00574" name="l00574"></a><span class="lineno">  574</span>    } <span class="comment">// if (accept_num_encoding &amp;&amp; isdigit())</span></div>
<div class="line"><a id="l00575" name="l00575"></a><span class="lineno">  575</span>    <span class="keywordflow">else</span> <span class="comment">// if (!(accept_num_encoding &amp;&amp; isdigit()))</span></div>
<div class="line"><a id="l00576" name="l00576"></a><span class="lineno">  576</span>    {</div>
<div class="line"><a id="l00577" name="l00577"></a><span class="lineno">  577</span>      enum_t idx;</div>
<div class="line"><a id="l00578" name="l00578"></a><span class="lineno">  578</span>      <span class="comment">// This assumes a vanilla enum integer value ordering within this [closed range].</span></div>
<div class="line"><a id="l00579" name="l00579"></a><span class="lineno">  579</span>      <span class="keywordflow">for</span> (idx = enum_t(enum_lowest); idx != enum_t(enum_sentinel); ++idx)</div>
<div class="line"><a id="l00580" name="l00580"></a><span class="lineno">  580</span>      {</div>
<div class="line"><a id="l00581" name="l00581"></a><span class="lineno">  581</span>        <span class="keyword">const</span> <span class="keyword">auto</span> candidate = Enum(idx);</div>
<div class="line"><a id="l00582" name="l00582"></a><span class="lineno">  582</span>        <span class="comment">/* Note -- lexical_cast&lt;string&gt;(Enum) == (operator&lt;&lt;(ostringstream&amp;, Enum)).str() -- the symbolic</span></div>
<div class="line"><a id="l00583" name="l00583"></a><span class="lineno">  583</span><span class="comment">         * encoding of Enum (as we promised to accept, case-[in]sensitively), not the numeric encoding.  The numeric</span></div>
<div class="line"><a id="l00584" name="l00584"></a><span class="lineno">  584</span><span class="comment">         * encoding is checked-for in the `if (accept_num_encoding...)` branch above using a non-looping technique. */</span></div>
<div class="line"><a id="l00585" name="l00585"></a><span class="lineno">  585</span>        <span class="keywordflow">if</span> (case_sensitive ? equals(token, lexical_cast&lt;string&gt;(candidate))</div>
<div class="line"><a id="l00586" name="l00586"></a><span class="lineno">  586</span>                           : equals(token, lexical_cast&lt;string&gt;(candidate), i_equal_func))</div>
<div class="line"><a id="l00587" name="l00587"></a><span class="lineno">  587</span>        {</div>
<div class="line"><a id="l00588" name="l00588"></a><span class="lineno">  588</span>          val = candidate;</div>
<div class="line"><a id="l00589" name="l00589"></a><span class="lineno">  589</span>          <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00590" name="l00590"></a><span class="lineno">  590</span>        }</div>
<div class="line"><a id="l00591" name="l00591"></a><span class="lineno">  591</span>      }</div>
<div class="line"><a id="l00592" name="l00592"></a><span class="lineno">  592</span>      assert((idx != enum_t(enum_sentinel)) || (val == enum_default));</div>
<div class="line"><a id="l00593" name="l00593"></a><span class="lineno">  593</span>    } <span class="comment">// else if (!(accept_num_encoding &amp;&amp; isdigit()))</span></div>
<div class="line"><a id="l00594" name="l00594"></a><span class="lineno">  594</span>  } <span class="comment">// if (!token.empty())</span></div>
<div class="line"><a id="l00595" name="l00595"></a><span class="lineno">  595</span> </div>
<div class="line"><a id="l00596" name="l00596"></a><span class="lineno">  596</span>  <span class="keywordflow">return</span> val;</div>
<div class="line"><a id="l00597" name="l00597"></a><span class="lineno">  597</span>} <span class="comment">// istream_to_enum()</span></div>
<div class="line"><a id="l00598" name="l00598"></a><span class="lineno">  598</span> </div>
<div class="line"><a id="l00599" name="l00599"></a><span class="lineno">  599</span>} <span class="comment">// namespace flow::util</span></div>
<div class="ttc" id="aclassflow_1_1Function_html"><div class="ttname"><a href="classflow_1_1Function.html">flow::Function</a></div><div class="ttdef"><b>Definition:</b> <a href="common_8hpp_source.html#l00512">common.hpp:512</a></div></div>
<div class="ttc" id="aclassflow_1_1util_1_1Null__interface_html"><div class="ttname"><a href="classflow_1_1util_1_1Null__interface.html">flow::util::Null_interface</a></div><div class="ttdoc">An empty interface, consisting of nothing but a default virtual destructor, intended as a boiler-plat...</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00044">util.hpp:45</a></div></div>
<div class="ttc" id="aclassflow_1_1util_1_1Null__interface_html_a5916282577627e424a09884347eddbba"><div class="ttname"><a href="classflow_1_1util_1_1Null__interface.html#a5916282577627e424a09884347eddbba">flow::util::Null_interface::~Null_interface</a></div><div class="ttdeci">virtual ~Null_interface()=0</div><div class="ttdoc">Boring virtual destructor.</div></div>
<div class="ttc" id="aclassflow_1_1util_1_1Scoped__setter_html"><div class="ttname"><a href="classflow_1_1util_1_1Scoped__setter.html">flow::util::Scoped_setter</a></div><div class="ttdoc">A simple RAII-pattern class template that, at construction, sets the specified location in memory to ...</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00144">util.hpp:145</a></div></div>
<div class="ttc" id="aclassflow_1_1util_1_1Scoped__setter_html_a12ca74f225f756458f872e6f0da60695"><div class="ttname"><a href="classflow_1_1util_1_1Scoped__setter.html#a12ca74f225f756458f872e6f0da60695">flow::util::Scoped_setter::~Scoped_setter</a></div><div class="ttdeci">~Scoped_setter()</div><div class="ttdoc">Restores *target (from main ctor) to its value at entry to said ctor; or does nothing if *this has be...</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00225">util.hpp:225</a></div></div>
<div class="ttc" id="aclassflow_1_1util_1_1Scoped__setter_html_a8547c08154499e1694202da49afb7202"><div class="ttname"><a href="classflow_1_1util_1_1Scoped__setter.html#a8547c08154499e1694202da49afb7202">flow::util::Scoped_setter::m_saved_value</a></div><div class="ttdeci">Value m_saved_value</div><div class="ttdoc">If and only if m_target_or_null is non-null, this saves *m_target_or_null. Otherwise meaningless.</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00198">util.hpp:198</a></div></div>
<div class="ttc" id="aclassflow_1_1util_1_1Scoped__setter_html_a9f61f7f731e78c9760b925b577cdd503"><div class="ttname"><a href="classflow_1_1util_1_1Scoped__setter.html#a9f61f7f731e78c9760b925b577cdd503">flow::util::Scoped_setter::Scoped_setter</a></div><div class="ttdeci">Scoped_setter(const Scoped_setter &amp;)=delete</div><div class="ttdoc">Prohibit copying: for each explicit ctor invocation, there shall be exactly 1 non-no-op dtor invocati...</div></div>
<div class="ttc" id="aclassflow_1_1util_1_1Scoped__setter_html_aa4464d1c39413033a0e457a494363bce"><div class="ttname"><a href="classflow_1_1util_1_1Scoped__setter.html#aa4464d1c39413033a0e457a494363bce">flow::util::Scoped_setter::operator=</a></div><div class="ttdeci">Scoped_setter &amp; operator=(const Scoped_setter &amp;)=delete</div><div class="ttdoc">Prohibit copying (see deleted copy ctor).</div></div>
<div class="ttc" id="aclassflow_1_1util_1_1Scoped__setter_html_ab36f9981921da6540fc5c308e4c19a9c"><div class="ttname"><a href="classflow_1_1util_1_1Scoped__setter.html#ab36f9981921da6540fc5c308e4c19a9c">flow::util::Scoped_setter::m_target_or_null</a></div><div class="ttdeci">Value * m_target_or_null</div><div class="ttdoc">Target object location; see ctors; if null then this is a moved-from Scoped_setter that intentionally...</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00195">util.hpp:195</a></div></div>
<div class="ttc" id="aclassflow_1_1util_1_1Scoped__setter_html_acd854f798e440e7f4a4c18c7b83443fc"><div class="ttname"><a href="classflow_1_1util_1_1Scoped__setter.html#acd854f798e440e7f4a4c18c7b83443fc">flow::util::Scoped_setter::Scoped_setter</a></div><div class="ttdeci">Scoped_setter(Value *target, Value &amp;&amp;val_src_moved)</div><div class="ttdoc">Post-condition: *target contains was val_src_moved contained at ctor entry; and the destructor invoca...</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00206">util.hpp:206</a></div></div>
<div class="ttc" id="aclassflow_1_1util_1_1Scoped__setter_html_ae0dcbc446c250933940ead3cb589c1eb"><div class="ttname"><a href="classflow_1_1util_1_1Scoped__setter.html#ae0dcbc446c250933940ead3cb589c1eb">flow::util::Scoped_setter::operator=</a></div><div class="ttdeci">Scoped_setter &amp; operator=(Scoped_setter &amp;&amp;)=delete</div><div class="ttdoc">Prohibit modifying existing *this; except that moving-from is enabled via the move ctor.</div></div>
<div class="ttc" id="aclassflow_1_1util_1_1String__ostream_html"><div class="ttname"><a href="classflow_1_1util_1_1String__ostream.html">flow::util::String_ostream</a></div><div class="ttdoc">Similar to ostringstream but allows fast read-only access directly into the std::string being written...</div><div class="ttdef"><b>Definition:</b> <a href="string__ostream_8hpp_source.html#l00045">string_ostream.hpp:47</a></div></div>
<div class="ttc" id="aclassflow_1_1util_1_1String__ostream_html_a7e64b069ae0e221952068c13fdc0f080"><div class="ttname"><a href="classflow_1_1util_1_1String__ostream.html#a7e64b069ae0e221952068c13fdc0f080">flow::util::String_ostream::os</a></div><div class="ttdeci">std::ostream &amp; os()</div><div class="ttdoc">Access to stream that will write to owned string.</div><div class="ttdef"><b>Definition:</b> <a href="string__ostream_8cpp_source.html#l00033">string_ostream.cpp:33</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html"><div class="ttname"><a href="namespaceflow_1_1util.html">flow::util</a></div><div class="ttdoc">Flow module containing miscellaneous general-use facilities that don't fit into any other Flow module...</div><div class="ttdef"><b>Definition:</b> <a href="basic__blob_8hpp_source.html#l00028">basic_blob.hpp:29</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_a024ddda9acb2b66f2a1b35cdb0c016aa"><div class="ttname"><a href="namespaceflow_1_1util.html#a024ddda9acb2b66f2a1b35cdb0c016aa">flow::util::in_closed_open_range</a></div><div class="ttdeci">bool in_closed_open_range(T const &amp;min_val, T const &amp;val, T const &amp;max_val)</div><div class="ttdoc">Returns true if and only if the given value is within the given range, given as a [low,...</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00287">util.hpp:287</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_a03984e29450abf9cf287c501d6c8f866"><div class="ttname"><a href="namespaceflow_1_1util.html#a03984e29450abf9cf287c501d6c8f866">flow::util::key_exists</a></div><div class="ttdeci">bool key_exists(const Container &amp;container, const typename Container::key_type &amp;key)</div><div class="ttdoc">Returns true if and only if the given key is present at least once in the given associative container...</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00301">util.hpp:301</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_a09a032f8e1e77a3afc0b7df115a773e1"><div class="ttname"><a href="namespaceflow_1_1util.html#a09a032f8e1e77a3afc0b7df115a773e1">flow::util::setup_auto_cleanup</a></div><div class="ttdeci">Auto_cleanup setup_auto_cleanup(const Cleanup_func &amp;func)</div><div class="ttdoc">Provides a way to execute arbitrary (cleanup) code at the exit of the current block.</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00307">util.hpp:307</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_a0a873d1abeac7a29822e940adf4f06c9"><div class="ttname"><a href="namespaceflow_1_1util.html#a0a873d1abeac7a29822e940adf4f06c9">flow::util::sequence_to_inverted_lookup_map</a></div><div class="ttdeci">void sequence_to_inverted_lookup_map(Sequence const &amp;src_seq, Map *target_map, const Function&lt; typename Map::mapped_type(size_t)&gt; &amp;idx_to_map_val_func)</div><div class="ttdoc">Similar to the 2-arg overload of sequence_to_inverted_lookup_map() but with the ability to store a va...</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00391">util.hpp:392</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_a0f681afaf67a0f917cf43a7ae893a015"><div class="ttname"><a href="namespaceflow_1_1util.html#a0f681afaf67a0f917cf43a7ae893a015">flow::util::to_mbit_per_sec</a></div><div class="ttdeci">double to_mbit_per_sec(N_items items_per_time, size_t bits_per_item)</div><div class="ttdoc">Utility that converts a bandwidth in arbitrary units in both numerator and denominator to the same ba...</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00237">util.hpp:237</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_a16357344c21456b86b7de3085e2661a2"><div class="ttname"><a href="namespaceflow_1_1util.html#a16357344c21456b86b7de3085e2661a2">flow::util::buffers_dump_string</a></div><div class="ttdeci">std::string buffers_dump_string(const Const_buffer_sequence &amp;data, const std::string &amp;indentation, size_t bytes_per_line)</div><div class="ttdoc">Identical to buffers_to_ostream() but returns an std::string instead of writing to a given ostream.</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00506">util.hpp:506</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_a18a29d6a6e65c3b96c52b5cad5971266"><div class="ttname"><a href="namespaceflow_1_1util.html#a18a29d6a6e65c3b96c52b5cad5971266">flow::util::istream_to_enum</a></div><div class="ttdeci">Enum istream_to_enum(std::istream *is_ptr, Enum enum_default, Enum enum_sentinel, bool accept_num_encoding, bool case_sensitive, Enum enum_lowest)</div><div class="ttdoc">Deserializes an enum class value from a standard input stream.</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00523">util.hpp:523</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_a34ed70fa4de81a4fdb9234bfb5a3a914"><div class="ttname"><a href="namespaceflow_1_1util.html#a34ed70fa4de81a4fdb9234bfb5a3a914">flow::util::subtract_with_floor</a></div><div class="ttdeci">bool subtract_with_floor(Minuend *minuend, const Subtrahend &amp;subtrahend, const Minuend &amp;floor)</div><div class="ttdoc">Performs *minuend -= subtrahend, subject to a floor of floor.</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00324">util.hpp:324</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_a67eecb5096dabfaff3d02c419b304540"><div class="ttname"><a href="namespaceflow_1_1util.html#a67eecb5096dabfaff3d02c419b304540">flow::util::size_unit_convert</a></div><div class="ttdeci">size_t size_unit_convert(From num_froms)</div><div class="ttdoc">Answers the question what's the smallest integer number of Tos sufficient to verbatim store the given...</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00346">util.hpp:346</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_a685b86585da2fa5186f51854e7ae1561"><div class="ttname"><a href="namespaceflow_1_1util.html#a685b86585da2fa5186f51854e7ae1561">flow::util::ostream_op_string</a></div><div class="ttdeci">std::string ostream_op_string(T const &amp;... ostream_args)</div><div class="ttdoc">Equivalent to ostream_op_to_string() but returns a new string by value instead of writing to the call...</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00381">util.hpp:381</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_a6b7316b3ed6d89f54c91e17c2aab101e"><div class="ttname"><a href="namespaceflow_1_1util.html#a6b7316b3ed6d89f54c91e17c2aab101e">flow::util::ceil_div</a></div><div class="ttdeci">Integer ceil_div(Integer dividend, Integer divisor)</div><div class="ttdoc">Returns the result of the given non-negative integer divided by a positive integer,...</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00258">util.hpp:258</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_a733448fee07c2a77e343a3f1590ff82e"><div class="ttname"><a href="namespaceflow_1_1util.html#a733448fee07c2a77e343a3f1590ff82e">flow::util::in_open_open_range</a></div><div class="ttdeci">bool in_open_open_range(T const &amp;min_val, T const &amp;val, T const &amp;max_val)</div><div class="ttdoc">Returns true if and only if the given value is within the given range, given as a (low,...</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00295">util.hpp:295</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_a8ae762ea4f743a98a73953d7f9ec2164"><div class="ttname"><a href="namespaceflow_1_1util.html#a8ae762ea4f743a98a73953d7f9ec2164">flow::util::in_open_closed_range</a></div><div class="ttdeci">bool in_open_closed_range(T const &amp;min_val, T const &amp;val, T const &amp;max_val)</div><div class="ttdoc">Returns true if and only if the given value is within the given range, given as a (low,...</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00279">util.hpp:279</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_a8afd30c50bcd670d45442df49d1da484"><div class="ttname"><a href="namespaceflow_1_1util.html#a8afd30c50bcd670d45442df49d1da484">flow::util::ostream_op_to_string</a></div><div class="ttdeci">void ostream_op_to_string(std::string *target_str, T const &amp;... ostream_args)</div><div class="ttdoc">Writes to the specified string, as if the given arguments were each passed, via &lt;&lt; in sequence,...</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00367">util.hpp:367</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_aa132928b364caefca5c3821e019924bf"><div class="ttname"><a href="namespaceflow_1_1util.html#aa132928b364caefca5c3821e019924bf">flow::util::buffers_to_ostream</a></div><div class="ttdeci">std::ostream &amp; buffers_to_ostream(std::ostream &amp;os, const Const_buffer_sequence &amp;data, const std::string &amp;indentation, size_t bytes_per_line)</div><div class="ttdoc">Writes a multi- or single-line string representation of the provided binary data to an output stream,...</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00413">util.hpp:413</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_ab10bc9e8bef148f875aa743fe0852743"><div class="ttname"><a href="namespaceflow_1_1util.html#ab10bc9e8bef148f875aa743fe0852743">flow::util::in_closed_range</a></div><div class="ttdeci">bool in_closed_range(T const &amp;min_val, T const &amp;val, T const &amp;max_val)</div><div class="ttdoc">Returns true if and only if the given value is within the given range, inclusive.</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00271">util.hpp:271</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_ab22fd89e165a9e6deaa174bc0dfdc8de"><div class="ttname"><a href="namespaceflow_1_1util.html#ab22fd89e165a9e6deaa174bc0dfdc8de">flow::util::Auto_cleanup</a></div><div class="ttdeci">boost::shared_ptr&lt; void &gt; Auto_cleanup</div><div class="ttdoc">Helper type for setup_auto_cleanup().</div><div class="ttdef"><b>Definition:</b> <a href="util__fwd_8hpp_source.html#l00205">util_fwd.hpp:205</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_af92e6183c2071f4166d4b5a91f50d70c"><div class="ttname"><a href="namespaceflow_1_1util.html#af92e6183c2071f4166d4b5a91f50d70c">flow::util::feed_args_to_ostream</a></div><div class="ttdeci">void feed_args_to_ostream(std::ostream *os, T1 const &amp;ostream_arg1, T_rest const &amp;... remaining_ostream_args)</div><div class="ttdoc">&quot;Induction step&quot; version of variadic function template that simply outputs arguments 2+ via &lt;&lt; to the...</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00352">util.hpp:352</a></div></div>
<div class="ttc" id="astring__ostream_8hpp_html"><div class="ttname"><a href="string__ostream_8hpp.html">string_ostream.hpp</a></div></div>
<div class="ttc" id="astructflow_1_1util_1_1Noncopyable_html"><div class="ttname"><a href="structflow_1_1util_1_1Noncopyable.html">flow::util::Noncopyable</a></div><div class="ttdoc">Useful as a no-unique-address private member to make a type noncopyable while keeping that type an ag...</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00073">util.hpp:74</a></div></div>
<div class="ttc" id="astructflow_1_1util_1_1Noncopyable_html_a14a71cd2314f39996c2609ab383145e8"><div class="ttname"><a href="structflow_1_1util_1_1Noncopyable.html#a14a71cd2314f39996c2609ab383145e8">flow::util::Noncopyable::Noncopyable</a></div><div class="ttdeci">Noncopyable(const Noncopyable &amp;)=delete</div><div class="ttdoc">Forbid copying.</div></div>
<div class="ttc" id="astructflow_1_1util_1_1Noncopyable_html_a50501b7b5fcc26f2bcb4503c7b32a360"><div class="ttname"><a href="structflow_1_1util_1_1Noncopyable.html#a50501b7b5fcc26f2bcb4503c7b32a360">flow::util::Noncopyable::operator=</a></div><div class="ttdeci">void operator=(const Noncopyable &amp;)=delete</div><div class="ttdoc">Forbid copying.</div></div>
<div class="ttc" id="astructflow_1_1util_1_1Noncopyable_html_ac59627ad248129dd7b37d2d9286761cf"><div class="ttname"><a href="structflow_1_1util_1_1Noncopyable.html#ac59627ad248129dd7b37d2d9286761cf">flow::util::Noncopyable::Noncopyable</a></div><div class="ttdeci">Noncopyable()=default</div><div class="ttdoc">Makes it possible to instantiate.</div></div>
<div class="ttc" id="autil__fwd_8hpp_html"><div class="ttname"><a href="util__fwd_8hpp.html">util_fwd.hpp</a></div></div>
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